package com.tensquare.base.service;

import com.tensquare.base.dao.LabelDao;
import com.tensquare.base.pojo.Label;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;
import util.IdWorker;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import javax.transaction.Transactional;
import java.util.ArrayList;
import java.util.List;

@Service
@Transactional
public class LabelService {

    @Autowired
    private LabelDao labelDao;
    @Autowired
    private IdWorker idWorker;

    public List<Label> findAll(){
        return labelDao.findAll();
    }

    public Label findById(String labelId){
        return labelDao.findById(labelId).get();
    }

    public void save(Label label){
        label.setId(idWorker.nextId()+"");
        labelDao.save(label);
    }

    public void update(Label label){
        labelDao.save(label);
    }

    public  void  add(Label label){
        label.setId(  idWorker.nextId()+""  );//设置ID
        labelDao.save(label);
    }

    /***  删除标签
    *  @param  id
    */
    public  void  deleteById(String  id){
        labelDao.deleteById(id);
    }

    public List<Label> findSearch(Label label) {
        return labelDao.findAll(new Specification<Label>() {
            /**
             *
             * @param root 根对象，把条件封装到那个对象中， root.getId
             * @param criteriaQuery 封装查询关键字  order by   group by
             * @param criteriaBuilder 封装对象条件， return null  不需要任何条件
             * @return
             */
            @Override
            public Predicate toPredicate(Root<Label> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                List<Predicate> list = new ArrayList<>();
                if (label.getLabelname() != null && !"".equals(label.getLabelname()) ){
                    Predicate predicate = criteriaBuilder.like(root.get("labelname").as(String.class)  , "%"+label.getLabelname()+"%");
                    list.add(predicate);
                }
                if (label.getState() != null && !"".equals(label.getState()) ){
                    Predicate predicate = criteriaBuilder.equal(root.get("state").as(String.class)  , label.getState());
                    list.add(predicate);
                }
                Predicate[] pr = new Predicate[list.size()];
                pr = list.toArray(pr);
                return criteriaBuilder.and(pr);
            }
        });
    }

    public Page<Label> pageQuery(Label label, int page, int size) {
        //封装分页对象
        Pageable pageable = PageRequest.of(page-1,size);
        return labelDao.findAll(new Specification<Label>() {
            /**
             *
             * @param root 根对象，把条件封装到那个对象中， root.getId
             * @param criteriaQuery 封装查询关键字  order by   group by
             * @param criteriaBuilder 封装对象条件， return null  不需要任何条件
             * @return
             */
            @Override
            public Predicate toPredicate(Root<Label> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                List<Predicate> list = new ArrayList<>();
                if (label.getLabelname() != null && !"".equals(label.getLabelname()) ){
                    Predicate predicate = criteriaBuilder.like(root.get("labelname").as(String.class)  , "%"+label.getLabelname()+"%");
                    list.add(predicate);
                }
                if (label.getState() != null && !"".equals(label.getState()) ){
                    Predicate predicate = criteriaBuilder.equal(root.get("state").as(String.class)  , label.getState());
                    list.add(predicate);
                }
                Predicate[] pr = new Predicate[list.size()];
                pr = list.toArray(pr);
                return criteriaBuilder.and(pr);
            }
        }, pageable);
    }
}
